How Well Do You Know JavaScript?

Question 1

1/10

What is JavaScript primarily used for?

Creating interactive web elements

Answer

Styling web pages

Answer

Building databases

Answer

Running server-side scripts

Question 2

2/10

Which of the following is NOT a JavaScript data type?

String

Boolean

Array

Float

Answer

myVar = 10;

Answer

variable myVar;

Answer

let myVar = 10;

Answer

Assigns a value to a variable

Answer

Checks if a variable is null

Answer

Concatenates two strings

Answer

Value of a variable

Answer

Index of a variable

Answer

Length of a variable

Answer

/* This is a comment */

Answer

Answer

# This is a comment

Question 3

3/10

What is the correct way to declare a variable in JavaScript?

var myVar;

Question 4

4/10

Which keyword is used to define a function in JavaScript?

func

def

function

fn

Question 5

5/10

What does the '=== operator do in JavaScript?

Compares values for equality without type conversion

Question 6

6/10

Which function is used to add an element to the end of an array in JavaScript?

push()

add()

append()

insert()

Question 7

7/10

What is the result of 10 + '20' in JavaScript?

1020

30

102

Error

Question 8

8/10

Which method is used to remove the last element from an array in JavaScript?

remove()

pop()

delete()

splice()

Question 9

9/10

What does the 'typeof' operator return in JavaScript?

Type of a variable

Question 10

10/10

What is the correct syntax to comment a single line in JavaScript?

// This is a comment